DE2431509A1 - COOLER-DRYERS OF CASTINGS AND MOLDING SAND - Google Patents

Description

Dipl.-In *. H. M1TSCHERLICH D —8 MÖNCHEN 22 Dipt.-lM. K. GUNSCHMANN. S «* n« k> rf «r.e. 10 Dr. rr ..t. W. KÖRBER * "*""" Dipl.-Iaf. J. SCHMIDT-EVERS? A Q 1 ς Π Q PATENTANWÄLTE * * »J I 0 U

July 1, 1974

Dr.Kö / me

Expert NV
Handelskade 24
Willemstad . Curapao

Patent application

Cooler-dryer for castings and molding sand

The invention relates to a cooler-dryer of castings and molding sand with at least one water supply and one Conveyor with an infeed and an outfeed end.

Such a cooler-dryer is known. The cooling and Drying takes place in that the warm sand and especially the hot castings come into contact with one another be brought so that the water present in the sand evaporates what heat is needed, the sand and the castings is removed. So the sand is dried and the sand and castings are cooled. When the temperature is too high and therefore more heat is to be extracted, water is supplied so that more water evaporates and more heat of evaporation used and removed from the castings and sand for cooling.

Around the molding sand emerging from the cooler-dryer To be able to use it again, the clay skin around the quartz grains must be maintained. For this purpose the

409886/0383

Molding sand must always be sufficiently moist. Around the molding sand emerging from the cooler-dryer comfortably and To be able to use it automatically for the next casting process, the molding sand emerging from the cooler-dryer preferably has the degree of moisture that makes the molding sand most suitable for the next operation so that it can be used needs to be dried or wetted as little as possible after leaving the cooler-dryer.

In the known cooler-dryer, the molding sand occurs at the discharge end in an irregular humidity state, since the amount of water evaporated in the cooling-drying process of the variable heat content of the cooler-dryer supplied castings and the molding sand is dependent.

The invention provides an improved cooler-dryer in this regard which is provided by at least one near the feed end arranged temperature sensor and a control element that is influenced by the temperature sensor and regulates the water supply is marked. The heat content is difficult to measure by means of a temperature sensor arranged in the cooler-dryer, since there is a risk of damage to the transducer because of the castings carried out. If the temperature sensor is protected from damage by means of a screen the sensor can also become insensitive to molding sand that is caking inside the screen.

In a preferred cooler-dryer according to the invention, these difficulties are also eliminated, since one is close to the A discharge end arranged tap for part of the molding sand is provided with a temperature sensor.

409886/0383

1! -! 2FECTED

The invention is explained in more detail below with reference to a drawing. Show it:

1 schematically shows a cooler-dryer according to the invention and

2 shows a preferred cooler-dryer according to the invention.

The cooler-dryer 1 according to the invention has a conveyor

3 with an inlet end 5 and an outlet end 6. To FIG. 1, the conveyor 3 consists of one driven up and down by an engine 4 in the direction of the arrows 2 Vibrating chute and, according to FIG. 2, one of a transmission

4 driven, rotating drum. The conveyor 3 conveys the blanks 12 and the molding sand 10, which pass through a channel 7 be poured into the conveyor 3 ^ in the direction of the arrow 8 from the infeed end 5 to the outfeed end 6, where the conveyor 3 a sieve 9 has to let the molding sand 10 fall onto a conveyor belt and over which the blanks 12 on a Conveyor belt 13 are removed. The conveyor 3 is provided with a water supply in the form of a spray pipe 14 which passes through a control flap 15 is regulated. At the infeed end 5 namely at those points where the mold contents consisting of castings 12 and molding sand 10 are in the form of a Separate liquid mass, a temperature sensor 16 is available. This temperature sensor can e.g. consist of a thermocouple exist. The temperature sensor 16 is via a comparison device 17, in which the actual temperature is compared with a setpoint value, and via an amplifier 18 with the control valve 15 coupled that the amount of the Spray pipe 14 outflowing water depending on the temperature of the molding sand 10 at the feed end 5 is regulated.

409886/0383

According to Figure 1, the temperature sensor 16 is on a reaching into the mass of the castings 12 and the molding sand 10, Attachment 19 attached to the conveyor 3.

According to FIG. 2, the cooler-dryer 1 has a feed end 5 Tap 20 in the form of at least one opening 21 in the drum wall and a collecting funnel 22 which opens onto a conveyor belt 23 and in which the temperature sensor 16 is accommodated is. The tap 20 has, for example, only one opening which is the same size as one of the meshes of the sieve 9. Of the The temperature sensor 16 is in the funnel 22 outside the area of the castings 12 and is therefore not endangered, so that it can advantageously be designed in the form of a sensitive temperature measuring mechanism.

409886/0383

Claims (2)

Expectations 1) Cooler-dryer of castings and molding sand with at least a water supply and a conveyor with a supply and a discharge end, characterized by at least one near the supply end (5) arranged temperature sensor (16) and one influenced by the temperature sensor (16), the water supply regulating regulating organ (15). 2) cooler-dryer according to claim 1, characterized in that that a tap (20) arranged near the feed end (5) for part of the molding sand (10) with the temperature sensor (16) is provided. The patent attorney 409886/0383 Blank page